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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5cf4fbddb2ce7035abb20183893f73032c2a2b2e56fe39db477adee08014a6d' 
  AND token = '/ADsvpnjXRQIug4GV7uQovz8sEbnc1gXnBb/zhzVDIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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