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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd5c1d5d5d2e3d14c1bed29552933c74a55c7b16c2b0f81f4622c5a8dabff4ac' 
  AND token = 'wfu9npjsDxBHyKOkOfECgPLNLXgerlEp9awIn/as1OM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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