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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ce89496a0491626caa466de469b427c56bef3c2bfa1072aa65c9e2092867468' 
  AND token = 'yJgbFdCDxcXgfYkd8xpy09cIxD0sCRzZrgP6+qZvM/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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