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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc57e8721e9c11b221d3f033eda01b717246cf0f175efa0e874f35d20f5fb5b4' 
  AND token = 'xZ/wXMxw0lIgA9ZcsIfJhaT4ZgPXmj8iylqerNeeVHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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