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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34409b7237cd5c28517312350abcd90d830a8aa003c5a885419e59166f95dadb' 
  AND token = 's7HSU2+g2YrLkkfsQRFmsKDEy+Oj2EQ6bIl+nB9Leo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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