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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a2a097b68c0c76dbcd4a632b3a45e9ce1ce57342a29568506b42bfd39fc3546' 
  AND token = 'Ygkxei/xGohaHgIRc6pGgO6k/O60kIQTew5+PYRCb80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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