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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b92969af493c06972c285005ba1f6d0645c38309678d27260d5ffb3d219a043e' 
  AND token = 'ly/za7qKWi8RMqFIu5p3W5u5fngFWqKjp+QKRliEvaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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