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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e90c9329097369aa06977fbc12e628f2bd945b19f01bf812e1b26dcc3885b2f8' 
  AND token = 'da004iGH8K4crsOF+6TzlBT2I6YwZh4anl6i5gwAOHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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