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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beab26431a0d48a5a3645ee6cc59b28d68039d3f5551e72f3ff05a265304d00d' 
  AND token = 'X61YSEp4fqFhsf6GZMsv1IEJD+WFKO6/eG4Cd3PC3Kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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