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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07da6f25d9a337f4ec89cdde7437322c3b2a31726a465e73a0e4709465dc95fa' 
  AND token = '4l4pzaAZsnlX+eP/a5CnMnATrH4oJliNh3Wu0SZWBwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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