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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df35c5ec3d1a7e5e33397582fb1c5f92a64d0ef2c97a71d4bd71723df8fe9f67' 
  AND token = '+fnqxJV/KrY3x0LIcWDLKhHodY6nsasQ6dlh6AdtpHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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