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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '741807949b8555371d576192ff3f9f4eae9c40b5fd13cc73273b44f31957ed1f' 
  AND token = 'yp6+eR7qaC6ZZcBd80tFnel9Q0iHgDr2cAEfYbD166Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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