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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ba5f78921b35fc3f7ac5dd335e9ac9ec60b6fdc8cc4d395aca8533b95403015' 
  AND token = 'yh8n5/KSLv+JMLQ+5NMXQD2MU+Rjhbt9BSFc5tyM/Zw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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