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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4bd096a8398499c74cee8cbea7043d6addccb68fd723356c206ee4da2eb015d' 
  AND token = 'hjZVRj88O9AVweH0hDUWIioh7eaPnkpXiyfNByXFJuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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