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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc7dadda631db09fe09432b9d497be1d12f2136d13fa91f22b7c2774022fe68c' 
  AND token = '1jBTU+aheVPM0ZQqGShuLXDh3FCbTk8gcqVgzx3B4I4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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