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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09bea298630433a77718526d0c3011149c315d54f82872ce15917730f5ca74dc' 
  AND token = 'yRB4dGuEBAWzF8yelckcf9LxecMpz4Xkxi6N6/onLQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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