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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60a70ed8f657c4c3f4a8a2789237ac1969f37b40c6ac71104f812a51267d30d8' 
  AND token = 'DHpc2Z9LxjcWv/Jj3kJi0Zp26EFSwdAFq1gIG9oory0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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