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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dac30237c3ec8dfd7fb965e32fd93a924d39da6826149020e820df3e34ac0a29' 
  AND token = '+yVYtWvJFyW+XvqJvQxmfEVq7/89tlBo/2DzmPmQse0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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