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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae8662517e091c310983d8eb7cb318bea16f3010b26a94acbf53c3a42dc690ab' 
  AND token = 'N5kc3F+V1kXlMfHhy8jRnof7jZHh9EWbFobhHyJtPf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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