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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1634db2ed1117fe0bd29d2fb69c07c0facfd7064cb276edcfc6b6a205aa4884b' 
  AND token = 'Xwj1Pi0t6Dlq/zBbYuevIW5Os8zKPtQlTXAqeMnPcfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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