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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc0eab19e0ab89c2c996f32801f39ad5ed3d27d114ed0dc0815480998cd64e91' 
  AND token = 'oJjC82LbDuFZT7B0XDV5zJ8h5qMmYGYuK8ejSqsbrlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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