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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '519a1b8c9b12fcd2b9ba2e0472f2fe218f12482094624230eee69bc36c0ddf0a' 
  AND token = 'idcux+FlvVgfLA/6oQpi1OmjsdsGUaxPIxGumxNeX0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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