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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ae1060143de266d57c64d37c093a40c46f4b03fe2d8deb8d7144ee61f3f27a5' 
  AND token = 'ULYrphVIzaAlDeh1uZTfBtZ5a+Rqsb6P8tGGhATcCuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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