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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e1c47c06d0cba7655eeea1e96d63ccabeed4631502061a006c5f3c17cf5becd' 
  AND token = '3ll1noobP1eS+NhU5GIfBJyHHPGXrqlDBzoBzdIPJ/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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