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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '435cf8271ca4c5af3343d3ca4df080e8d64515e96394ab4c5fb424e9c87a3451' 
  AND token = 'cnNSYh2HbbZkrvXt81M+kaLm829F6a5WI/55apBKaEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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