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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b884ae003779dc059c0c068e13ec56e34e45b25f3b4d2ed93e9a14caf9a4315e' 
  AND token = 'U8Umdvqe9aCHi9OVUcPlJV0XY39bj7xJlzUrd5eOvKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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