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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfee94ee41065d3412471c96a72028991feb544f2bc4cfaf0bf59b0d8082ee03' 
  AND token = 'ceUfkXH9eO14ndItE4helrGsPjQTqx5cfX08bYpM73Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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