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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36832285d0ce8b95841f9982dbe9108d67ee7be66e484d7cecad3acfa70dbdbd' 
  AND token = '+QFO5Aqk//3dFQ24C7b4dGDlXlJFLntU4+MJt2Z1e+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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