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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4472944337ca0fb8eb062f7d45d5af2148370b40e348ad0aa2f73259ac538bc1' 
  AND token = 'A4RXUYRHjZpgd+CcchDfaTFmenZMT++eU5iaLYc83LE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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