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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0187c79202cb69564f7f3ee145ac24ed460c33ae1a61257deb724172392c32cd' 
  AND token = 'xsomBozFQXdcotoFqz1S7R9UtmSSUCieyNL8/78dZgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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