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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7028337dddf88fe3ac20b0d5d315091841d01aba15f3c0b20b69631af31db213' 
  AND token = 'tWxp9aoBt0c8hs+tZwi0bUnBl3ljIdEz51B8qRKxhgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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