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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69c059e96e5c5b58bf96687f08bb08f1a8ebaa22d7140ef45efff3b72e00b5a8' 
  AND token = 'JijBiHifiyA+XAPKW+k8FcrLK2NKmJ890sdVOOEf1wI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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