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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbb5f6c0090c68970cb442f20f0a2b6ca95f5ba0c86cd634b095373cbe6b49e7' 
  AND token = '6UVOcEbFkuTUV205dttJg97Dx1brzGsTBQ0DirowWPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}