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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28ef8d905be2b918dbfc73e220c55f21dfcef2aee735f06584e8dfc68eee1c9e' 
  AND token = 'ILsQnL9Vbh3tvgk6as/pPKn5jcq4rhyuJ4kMq8J8APk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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