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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b70a0108297c2efbb136f234a2bd6c0255732586210269535dac3bb006b65717' 
  AND token = 'ImYpqbOkrrQ3mGo8clSl8sEoM3h9Lm1B0mgVm6Xl/gM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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