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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc8ddafc74fe6a769458ddc6a703a8d7393807889b21115895e2dfc5943e7753' 
  AND token = 'psB1zE+1656jKEsSbmUwL3vxsFoidkN0tirS0PBhSKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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