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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cb3f452eda649077791e5fd42da70c768a7893e3ea878b43aca6f79e99575fa' 
  AND token = 'SbsG6wP/PIdQZuN97GL8NHdA6ccpsUl67JgSc/gvsUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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