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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '519ac03880deb3d0d9b15a3304a9a64b54b85d76788e011267f48d9319beef77' 
  AND token = 'cjkdrYWZi1F8+vmcEZBeSF2LvtsxHVc2TctsHnGEcGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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