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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdd828d5e4ed7279c88cee97f2df015b464895df28f26dd206906379f1870aad' 
  AND token = 'LJce0BjyqAiwLUgDH6aI0N78w2qN8IzMREfypJymxHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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