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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd89cbed30944fd5871a53f54920d1118f482ced6b4c88c2b41552d4395b60ef0' 
  AND token = '+WykjgwcvNpIByKOLf4KuOh0i0kK2wJ9tubRx7dGJ/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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