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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d7ac7b348a662325ab202ad9191291b546b413fc205aca0104da0a8d4f8ea5b' 
  AND token = 'D4lhabh6HpPWzDRjcb3azpg/OWtY8mMIY/axX6qiYic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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