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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e39eb62989323c43e8e32a32f753f49ac6ced19c41b20af21e6963795ae4a9e' 
  AND token = 'ZS7nqloajJ7C1FecqtNswhDtpZ8TYA2CUvqNG18/v2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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