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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5217afc69b537b4c030825f53a72ff293ebb0f2d6a7cf1e8cf7bd214e09a44c' 
  AND token = 'fLN7Pi5UjsngqcDcw5sAJlHpH9N/T0oBZI5OFtK6S3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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