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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc23f41329b0ee54b25fe1c1396e980b6050279fefbe3dd10626457785deecc7' 
  AND token = '1TFlbm7VmSwVCP8DA1NyxmAccDE9T17CqskhlQaK3l8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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