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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d91b50ae00474ac422af23c5f3a1ebf74bc5e9dc1c2f3d558605c53a10e1783' 
  AND token = 'ANUt4GpSzFxoA5JTL+AklzyljIVyX9+TTS9zrwnyQVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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