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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75521ace1421dca3358709cb2be5b9974cfc81942ca2e58798e3fb9aa34bef27' 
  AND token = 's/7jZvM86bqSh0p60eOyEpv+x9M/2Tk+xhcK1UJPoOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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