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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b7b942719ccd93cf29e2e6f9e175652095e48ddce87c59c9d86eb2e0700d52e' 
  AND token = 'xNbHo8m33X05OLsr8PCSr5fsy7URAJhBMfa8rE/n6rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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