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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '898d8fc9f0203d6f0cab8423f617d498ad32eff64215a245e64ca64eb6ef7788' 
  AND token = '9ItYYOzA7JkxC6MI/EELzQxBsUEDoaTGi4l/DpUUfEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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