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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c1d184ee6a7b4f867223785489ba5fd9dceffb6a55ad6b863cbcfb1fb6c4d0a' 
  AND token = 'x16URQ/BLuHGPLP73hiLvyd5/gD/nK/EQH6+MOK0yIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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