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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85ce0772355b0902909d3f5a088fd2b1f6e387b9bc2da10ced06f7bdfa59e65a' 
  AND token = 'qpzBXUdQQqpvelwqIrX/jg2zfC/o9wc7fCdlLitGo+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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