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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28b6fc3e6a0f1e6da8509855235cf349a2d3bfec7d7bf3631380f8515ab26c33' 
  AND token = 'Zs4YgipIoKtFDURelMVYJj0rox5X+Zli+P+jLFCrtyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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