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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11ac7146f16f12d7b94f76c30442b6f891227d1e292220a0fed93c0206513e9b' 
  AND token = 'UzzQms3EClmD/dntvPaB5ViT51pCS7ORh+BJ6E74uuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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