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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95d19ccf4a21106adb4f1e6ae86b4d443b218db0349933909a16a6a6e522e1c0' 
  AND token = 'yK+/+w494UQT+/W0pvp7jzNx0GioL3+4sHZhUKJHUBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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