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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32fdb2322b243ccb0fbc5d8f93403a742a1649b4316737600683f10fa4cd824d' 
  AND token = '3i80KHQ11sOoiVgpbc1hMiz9LH7qgYoP3upixm4gtww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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