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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9c1bea5c2e5bccf1f755a518ba599c2eed10fc56383fe950ec4ab9e1f68f564' 
  AND token = 'RdLuYFL8SGbs8cXYo8JQnLZU2JwYv3NJDsXJZ99RLVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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