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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddba701b13f1e4fd3772ba0fd83c9eb1dafdb53150e37c9b5e85edbe4b96cf99' 
  AND token = 'bvOlxjxzbsaA0gpMU47oNF8ei7hJJuC9StxaHUuAm8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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