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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '229cfb4609afddb9adf99230e59beb9924c11aaee5e650493729f62991c455e3' 
  AND token = 'kuN6k636xILnhtRrbqtL/M6C83s1/oJvnv37Z9Zx820=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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