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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fdf8a52b68df25093709f4366f8372b81d23c74e61fcd1e5b65cc41b7c196e5' 
  AND token = 'V2ai2RA8mz1GA/vj3vRS08TkE+SJdgitn3ofPQ6MPu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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