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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffac6edefead3f9950a82b49df524e6b2700ad539b84f984034ae41b97697f48' 
  AND token = '7zN0ZVCtPJNK29bIE6SAvno8sV3h9ltln8fPRFJdaKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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