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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92bde04cadcc8e5def7b23054748c79556bf173177419f1e2a4dea7223573a29' 
  AND token = 'PIT7cZdHryt2ELXd9GXwdkP3BFc6rmAsy0HAGWWT3zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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