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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6ed53132abb58bae244ce28aa9dc01a203953f780848b147cb76f1cd4016a36' 
  AND token = 'wx7hgZAgosjehmlEEL6OpHOF/dL/lh7iEqyeU5sPaLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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