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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffdc1845b53ae2dd6f55ace31784f1bde977bb6acbd8dc7a909ec0ad37d933e7' 
  AND token = 'DALhKIgSdoTSHEBmVdrUEPtMMJ7N2ZF/2M0pqKAwtHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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