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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc437ab698b1ad2792fc4785b3e089a4c7120b1be8f23ab74e3ba3b02f48e8d0' 
  AND token = 'RDCptngwYiiErcroAubChH1boJQNPVu8Kcgwgaqx1LA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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