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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c5bb8c17ae210981aff8aaeb88824389a558b7e4ac22c1538fb5b1dedcfaaf4' 
  AND token = 'T95QiG6OOVfO7YFHzV4ntR3tkVYZ9dffDspH7xnTmBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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