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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '835b466ab5bec24d5d6f651f0a66d87b9edfb8d612f5b329f3c9710201457881' 
  AND token = '5K9QBqaHY9t1d3T2/23VKxJQ3Eg3hoyKq452jRXmiE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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