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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7f2824d2dd9a4ad679c0daf93d73bbfbfa718464ce5e216905971e27a7ad792' 
  AND token = 'a3THJ85sm12/5LuF+qlJqp0dJSTRifVzoBQdYU4qOEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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