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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bb68816269cfe4c99548273cfee0dc258172ec79137cfd9dc70543293d611fc' 
  AND token = 'FEXAzurWDT9iKqaNh0C44JUoU/0WBLlOA6as0gBMVEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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