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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69e8775877571d34095efa50067f72a32740dc9e523ee96916ca5813e467c0dd' 
  AND token = 'QSVLtVdgdl70tBT3peoIrjVZKqK7g/Ct65UaIytbAeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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