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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd06fe499892a98080c4dc9aeb1238e028a2b0f58b3adcea3ea34f6bf8a5ac128' 
  AND token = 'aDT5dNRgJXkkxF9aq+a0OTgvZfpCEldhDEkW+AIw+8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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