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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84156e0db57c91f105389a3bc77831997f849ecc13c585b156e6a3718fa6e53a' 
  AND token = '1c6xNj6Kk6L0JJs88cO1Qi4JTEJ7JQCEZoeH5r00Cy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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