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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '723a520adf61666d025744effa789c8edbb7ecce0fda7cedb1b86673b63332bf' 
  AND token = 'lZVDuxVCeL80RCIwl6ZAywTa5vQqMLuNsjd3qTokSSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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