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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7edf14e15c8f87fb37fb88113cde3a0a5c922b2b7fbadade51b5326a817e08ad' 
  AND token = 'rpHBDpVa1kRiY4OMQruYuv8RdIVtNifUUy4cy6QIltQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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