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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4aeb84bd759736a311e0e24067bcafd7b04f07093c4a2fec8c526e94fceda4c8' 
  AND token = '+BFKeAo68fxAsadNtAjFm5yHWy5bPQ6l9wyYedtNDmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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