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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e4d0ca9e96dc512bb665f7bcdb7cdb8629fc3b4727bc6d2b24aec1d79c40cf7' 
  AND token = '+E1nadPoezcqtiRNWBp9EmEMRE5l8eo3/ejaIUQIFgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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