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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9459c3c9e1e5639ffd6ba14ff058ddaba3e0d572a3b9b61a9cb1e0d6b38a4399' 
  AND token = 'jdpEDvqDrHvzWCnZwCuaX/9AnFzEnPpsGe707xUNJWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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