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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc10499c95aded55b065ad0549704cb8ddb07400931c71734b2410f009f2123d' 
  AND token = 'rIXtGNYd8jUUa6+Lp7sMxQJhwLGU9iv1r1RJGhflWhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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