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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6508ccd5d5c2271c2d2e89016cc2f8c9dd16db228ba10a679db4bbb541933e89' 
  AND token = 'G83cU+PKgKAbVfzyfkkif0g6NcVt3SnIT3CY3oQBqWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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